Reproductive biology of seven taxa of <i>Magnolia</i> L. in the south of Russian Far East

Abstract

This paper presents the phenology of seven taxa of the genus Magnolia L., pollen biology on germination and storage conditions, seed productivity, germinating ability of seeds and its dependence on stratification and germination conditions. It has been found that M. kobus DC, M. kobus var. boreales Sarg., M. obovata Thurb., M. officinalis Rehd.in cultivated condition produce pollen at a low viability rate (9.4 -31.7%). Real seed productivity of the taxa being studied is less than their potential productivity. However, M. obovata, M. officinalis and M. tripetala are characterized by high seed germinating ability, up to 94%. Optimal germination conditions for seeds of M. tripetala, M. officinalis and M. obovata require protected ground (greenhouse) and stratification at 4ºC during 30 days. The high germinating ability of M. sieboldii seeds in the open ground is explained by stratification duration and temperature required for this species. Sarcotesta effects on higher seed germinating ability have been observed in M. obovata only.

Arabinogalactan proteins mark stigmatic receptivity in the protogynous flowers of Magnolia virginiana (Magnoliaceae)

“…Protogyny has been reported as a common mechanism of dichogamy in most basal angiosperm lineages with hermaphroditic flowers (Endress, 1990, 2010, 2011). Usually, in species of the genus Magnolia , the female phase of the dichogamous cycle is accompanied by an intense release of scents and thermogenesis at tepal closure (Dieringer et al, 1999; Bernhardt, 2000; Seymour et al, 2010; Kameneva and Koksheeva, 2013; Wang et al, 2013). This suite of flowering characteristics has been suggested to be the result of a tight pollinator–flower coevolutionary history (Thien, 1974; Thien et al, 2009; Gottsberger et al, 2012; Wang et al, 2013; Pang and Saunders, 2014).…”

Flowering, floral visitors and climatic drivers of reproductive phenology of two endangered magnolias from neotropical Andean forests

“…To estimate the percentage of pollen germination, we collected pollen grains by gathering flowers of both species at the female stage and waited for anther dehiscence. Pollen grains were then spread on slides with germination medium containing 5% sucrose and agar (Kameneva & Koksheeva, 2013). Pollen germination percentages were estimated 1 day later in the laboratory, according to the number of germinated and non‐germinated pollen grains, through direct observations under a light microscope.…”

Karakteristik Morfologi Dan Viabilitas Polen Pada Empat Jenis Magnolia

“…Penelitian biologi reproduksi telah dilakukan pada beberapa jenis Magnolia (Allain et al 1999;Kameneva & Koksheeva 2013;Chen et al 2016;) termasuk pada bagian polennya. Polen Magnolia memiliki catatan fosil yang panjang dan bentuk morfologi paling primitif yang pernah dipelajari (Agababian 1972), sehingga marga dan jenis ini menjadi lebih terspesialisasi.…”